CN101669296A - Method for transmitting signals for achieving diversity gain - Google Patents

Method for transmitting signals for achieving diversity gain Download PDF

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Publication number
CN101669296A
CN101669296A CN200880013305A CN200880013305A CN101669296A CN 101669296 A CN101669296 A CN 101669296A CN 200880013305 A CN200880013305 A CN 200880013305A CN 200880013305 A CN200880013305 A CN 200880013305A CN 101669296 A CN101669296 A CN 101669296A
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transmitting
mapped
emission
transmission path
antennas
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CN200880013305A
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CN101669296B (en
Inventor
崔镇洙
吴旼锡
朴亨镐
文诚颢
朴奎镇
郑载薰
成斗铉
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1893—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/26—Monitoring; Testing of receivers using historical data, averaging values or statistics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/345—Interference values
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload

Abstract

A method for transmitting signals for achieving diversity gain is provided. In a communication system having multiple independent transmission paths, a signal is transmitted by mapping it to differentindependent transmission paths at initial transmission and at retransmission, thereby obtaining diversity gain. Especially, real and ideal components of a transmission signal are mapped to differenttransmission paths, thereby obtaining additional gain.

Description

Be used to realize the method that transmits of diversity gain
Technical field
The present invention relates to be used to realize the method that transmits of diversity gain.
Background technology
We at first describe the structure of general many antennas ofdm communication system.
Fig. 1 illustrates the transmitting terminal of the use single codeword (SCW) in general many antennas ofdm communication system and the structure of receiving terminal, and Fig. 2 illustrates the transmitting terminal of the many code words of use (MCW) in general many antennas ofdm communication system and the structure of receiving terminal.
As shown in Fig. 1 and Fig. 2, the transmitting terminal 100 in general many antennas ofdm communication system comprises encoder 101, HARQ functional module 102, channel interleaving 103, serial (S/P) transducer 104, mapper 105, resource distribution module 106, IFFT module 107 etc.
Specifically, encoder 101 is carried out coding so that extra bit is inserted in the data bit, so that reduce channel or The noise, and HARQ functional module 102 is carried out and launched again and rate-matched.Channel interleaver 103 is based on bit, and the CRC in making bit and being inserted into this bit etc. mixes, so that the concentrated burst error that may occur in the extended channel.S/P transducer 104 is converted to parallel signal with serial signal.Mapper 105 is a symbol with the parallel bit information translation.To suitable sub-carrier positions, and IFFT module 107 is the OFDM symbol with this symbol-modulated to resource distribution module 106 with this sign map, and on channel 300 this OFDM symbol of emission.
Because the transmitting terminal 100 of Fig. 1 uses single codeword, therefore as shown in fig. 1, the transmitting terminal 100 of Fig. 1 comprises an encoder 101, a HARQ functional module 102 and a channel interleaver 103.On the other hand, because the transmitting terminal 100 of Fig. 2 uses two code words, therefore as shown in Figure 2, the transmitting terminal 100 of Fig. 2 comprises two encoders 101, two HARQ functional modules 102 and two channel interleavers 103.
As shown in Fig. 1 and Fig. 2, receiving terminal 200 can comprise that FFT module 201, resource separate distribution module 202, de-mapping device 203, parallel/serial (P/S) transducer 204, channel deinterleaver 205, separate HARQ functional module 206 and decoder 207.Receiving terminal 200 received signals, and the opposite program of execution and transmitting terminal 100.
Specifically, in receiving terminal 200, separate distribution module 202 by FFT module 201 and resource and extract the data of transmitting by channel 300 from physical channel.Then, by de-mapping device 203 symbolic information is converted to bit information.Then, this bit information passes through P/S transducer 204 and channel deinterleaver 205, and is separating HARQ functional module 206 places with the code rate of code rate switches back in decoding, and then this code rate is input to decoder 207.At last, decoder 207 estimated data bits.
After this, by error-detecting code, determine in the emission grouping, mistake whether to have occurred such as the CRC bit.If determine to have occurred mistake, then receiving terminal 200 returns the NACK signal to transmitting terminal 100, and if determine mistake not occur, then receiving terminal 200 returns ack signal to transmitting terminal 100.When receiving ack signal, transmitting terminal 100 is not launched data again, and when receiving the NACK signal, transmitting terminal 100 is to launch data again by the scheduler named order.
Described the function of the resource distribution module 106 that is associated with data launching technique again in more detail below, the data that this function relates in the HARQ function in the structure of the above transmitting terminal of describing with reference to figure 1 and Fig. 2 and receiving terminal 100 and 200 are launched again.
Fig. 3 illustrate wherein resource distribution module with data map to a plurality of antennas to launch the conventional method of these data again by these a plurality of antennas.
As shown in Figure 3, in traditional launching technique again, by launching grouping again by the identical antenna of its emission grouping with previous.Here, can change or not change sub-carrier positions to its assigns packet data.
If in the above described manner when launching again at every turn by with before launched data again by the identical antenna of its emission data, then launching data to before launching on the similar channel of data thereon, and be difficult to fully utilize the channel diversity gain.That is, if on the channel of difference, after the emission data, when second emission, on good channel, launch data again in first when emission, then this reduction of performance of causing owing to poor channel of radiating portion ground compensation again.Yet, if, be difficult to realize the channel diversity gain by launching data again with antenna identical during first emission.
Summary of the invention
Technical problem
Be designed to solve a kind of signal transmitting method of the object of the present invention is to provide of described problem, this method can obtain enough channel diversity gains when launching data again in many antennas and/or the general ofdm communication system.
Technical solution
Purpose of the present invention can realize in the method that the communication system with a plurality of independent transmission path transmits by a kind of being used for is provided, this method comprises: first emission process, this first emission process comprise by according to specific mapping ruler a plurality of transmitting being mapped to a plurality of independently transmission paths and launching this a plurality of transmitting; And second emission process, this second emission process comprises by in a plurality of the transmitting each is mapped to the independent transmission path different be mapped to this independent transmission path that transmits in first emission process launches this a plurality of transmitting again.
Transmitting can be complex signal.In this case, can launch this real part and imaginary part by in first and second emission processs, the real part of this complex signal being mapped to different independent transmission paths with imaginary part.
In addition, this method may further include at least one extra emission process, and this extra emission process comprises by a plurality of transmitting is mapped to a plurality of independent transmission path and launches this a plurality of transmitting again.Here, when the total number of the emission process that comprises this at least one extra emission process is less than or equal to the number in a plurality of independent transmission path, preferably, launch this a plurality of transmitting by in each of emission process, in a plurality of the transmitting each being mapped to different independent transmission paths.
When communication system was duplicating multi-antenna orthogonal frequency division (OFDM) communication system, a plurality of independent transmission path can comprise at least one in a plurality of transmission paths that formed by a plurality of antennas and a plurality of subcarrier zone.Here, a plurality of subcarrier zone can be the subcarrier zone with the minimum at least coherence bandwidth between the subcarrier zone.
On the other hand, when communication system was many antennas single carrier-frequency division multiplexing (SC-FDM) communication system, this a plurality of independent transmission path can comprise at least one in the transmission path that is formed by a plurality of antennas.
In another aspect of the present invention, provide a kind of method that is used in a plurality of complex signals of communication system emission with a plurality of independent transmission path here, this method comprises: real part that will these a plurality of complex signals is mapped to different independent pathways with imaginary part; And emission a plurality of complex signals of being shone upon.
To make detailed reference to the preferred embodiments of the present invention with reference to the accompanying drawings now.Hereinafter the detailed description that will provide with reference to the accompanying drawings is intended to explain exemplary embodiment of the present invention, and is not that the embodiment that can realize according to the present invention only is shown.Following detailed comprises specific details, so that complete understanding of the present invention is provided.Yet, it should be apparent to those skilled in the art that and can under the situation that does not have such specific detail, put into practice the present invention.
In some instances, known structure and equipment are omitted or illustrate with the block diagram form, concentrate on the important feature of structure and equipment, so that do not cause concept obfuscation of the present invention.In this specification, will use identical Reference numeral to represent same or analogous parts in the whole text.
As mentioned above, the present invention proposes a kind of signal transmitting method, this method obtains enough channel diversity gains in the time of can launching data again in many antennas and/or general ofdm communication system.Promptly, the present invention proposes a kind of signal transmitting method, wherein, by when transmitting in the communication system with a plurality of independent transmission path, transmit by different independent transmission paths and to obtain enough diversity gains, this communication system is such as the ofdm system that comprises a plurality of subcarriers zone, and this a plurality of subcarriers zone has the minimum at least coherence bandwidth between the subcarrier zone, perhaps comprises the multiaerial system of a plurality of antennas.In a preferred embodiment of the invention, when the emission time multiplexed signal, launch the real part and the imaginary part of this complex signal by different independent pathways, thereby not only realized the diversity gain in the territory, independent transmission path, but also realized the diversity gain in real domain and the imaginary field.
Advantageous effects
According to the present invention, the independent transmission path that its mapping is transmitted all is different when being configured to whenever emission that this transmits, thereby obtains diversity gain.In addition, be time multiplexed signal when transmitting, separate the real part and the imaginary part of this complex signal, and the real part of this complex signal is mapped to different transmission paths with imaginary part, thereby further improve systematic function.
Description of drawings
Included accompanying drawing is used to provide further understanding of the present invention, and accompanying drawing illustrates embodiments of the invention, and is used from explanation principle of the present invention together with describing one.
In the accompanying drawings:
Fig. 1 illustrates the transmitting terminal of the use single codeword (SCW) in general many antennas ofdm communication system and the structure of receiving terminal;
Fig. 2 illustrates the transmitting terminal of the many code words of use (MCW) in general many antennas ofdm communication system and the structure of receiving terminal;
Fig. 3 illustrate wherein resource distribution module with data map to a plurality of antennas to launch the conventional method of these data again by these a plurality of antennas.
Fig. 4 illustrates the flow chart that is used to the method that transmits according to an embodiment of the invention;
Fig. 5 illustrates and is used for being mapped to a plurality of antennas by transmitting according to an embodiment of the invention and launches the method that this transmits;
Fig. 6 illustrate according to a preferred embodiment of the invention be used for be arranged to be mapped to the method that different antennae is launched this signal by real part and imaginary part that plural number is transmitted;
Fig. 7 illustrates the method that is used for according to an embodiment of the invention in the multiaerial system emission complex signal that comprises two antennas;
Fig. 8 and Fig. 9 illustrate the method that is used for launching in the multiaerial system that comprises four and two antennas complex signal according to a preferred embodiment of the invention respectively;
Figure 10 and Figure 11 illustrate illustrative methods according to a preferred embodiment of the invention respectively, and wherein in the system that comprises four and two antennas, transmitting is mapped to diverse location, have been launched eight times and four times altogether until them;
Figure 12 illustrates FER in the detailed example according to an embodiment of the invention to the curve chart of SNR performance, carries out to comprise two emissions of emission again in this detailed example in the communication system of using two transmitting antennas;
Figure 13 illustrates FER in the detailed example according to an embodiment of the invention to the curve chart of SNR performance, carries out to comprise two emissions of emission again in this detailed example in the communication system of using four transmitting antennas;
Figure 14 illustrates FER in the detailed example according to an embodiment of the invention to the curve chart of SNR performance, carries out to comprise three four emissions of emission again in this detailed example in the communication system of using four transmitting antennas; And
Figure 15 and Figure 16 illustrate according to another embodiment of the invention be used for be mapped to a plurality of subcarriers zone by transmitting and launch the method that this transmits.
Embodiment
Fig. 4 illustrates the flow chart of signal transmitting method according to an embodiment of the invention.
According to embodiments of the invention as shown in Figure 4, at first,, be mapped to a plurality of independent transmission path with transmitting according to specific mapping ruler at step S401 place.This a plurality of independent transmission path can be a plurality of antennas that are included in the multiaerial system, perhaps can be the independent sub-carriers zone in a plurality of subcarrier system.This specific mapping ruler can be that a plurality of transmitting is mapped to a plurality of independent transmission path respectively.After this, at step S402 place, be transmitted in step 401 place and be mapped to transmitting of a plurality of independent transmission path, this will be called as " first emission ".
At step S403 place, after step S402 place carries out first emission, determine whether to be necessary to launch again.In any situation that emitting side needs to transmit again, for example also do not receive the situation of ack signal from receiver side, define necessity and launch again.
When determining to launch again, stop the program of Fig. 4 at step S403 place.When defining necessity at step S403 place and launch again, this program advances to step S404.At step S404 place, each that transmits is mapped to and these different a plurality of independent pathways in path that transmit and be mapped to when first launches.Each is transmitted when launching again in first emission and to be mapped to different a plurality of independent pathways and can to obtain diversity gain.Then, at step S405 place, launch mapped transmitting, this will be called as " second emission ".
At step S406 place, determine whether another emission is necessary.For example, though when having carried out first emission also not when receiver side receives ack signal, perhaps when be necessary to carry out comprise first and second launch a plurality of emission that transmits the time, determine that another emission is necessary.When determining need not another emission at step 406 place, stop the program of Fig. 4.When determining that at step S406 place another emission is necessary, this program advances to step S407.Whether the emission total numbers of determining to comprise first and second emissions at step S407 place are less than or equal to the number in the independent transmission path that is used to pass emission.Be less than or equal to the number in the independent transmission path that is used to launch if determine the total number of emission at step S407 place, such as the total number of the antenna that is used to launch or the sum in subcarrier zone, then this program advances to step S408, the mapping and the emission that transmit with control, make when emission transmits, each that transmits is mapped to different independent transmission paths.For example, have in the situation in four independent transmission paths in system, mapping and emission that control transmits make identical transmitting not to be mapped to identical independent transmission path, are launched four times altogether until transmitting.If determine the number of the total number of emission at step S407 place, then can be remapped to a plurality of independent transmission path by transmitting and launch this and transmit according to specific mapping ruler greater than the independent transmission path.For this reason, this program can turn back to step S401, to repeat subsequent process as shown in Figure 4.
With reference to specific embodiment, wherein will be according to an embodiment of the invention method be applied to use the multiaerial system of a plurality of antennas.
Fig. 5 illustrates and is used for being mapped to a plurality of antennas by transmitting according to an embodiment of the invention and launches the method that this transmits.
This embodiment that is applied to multiaerial system relates to how determining employed antenna index in the time will being assigned to physical channel based on the data item of sign map, and how data item is assigned to physical channel when the emission data item.That is, determined according to as shown in Figure 5 allocation rule after, be transmitted in the data item that the mapper place is mapped to symbol by antenna how by antenna emission data item.
Specifically, Fig. 5 shows following structure, and wherein, in the multiple antenna communication with four transmitting antennas, complex signal is mapped to a plurality of antennas and a plurality of antennas of passing through to be shone upon are launched.When each complex signal all was launched four times, this complex signal all was mapped to different antennas in each emission.For example, as shown in Figure 5, whenever the S that transmits 1, I+ jS 1, QThe time, it all is mapped to different antennas, makes this signal S 1, I+ jS 1, QWhen first emission, be mapped to first antenna, when second emission, be mapped to second antenna, when the 3rd emission, be mapped to third antenna, and it is mapped to the 4th antenna when the 4th emission.According to this embodiment, can in the antenna territory, obtain diversity gain at each symbol.
When as shown in Figure 5 four transmitting antennas are provided the time, when symbol was launched at least four times, the component of each symbol experienced the channel of all four antennas uniformly, thereby made diversity maximization.
Fig. 6 illustrate according to a preferred embodiment of the invention be used for be arranged to be mapped to the method that different antennas is launched this signal by the real part that plural number is transmitted with imaginary part.
Promptly, embodiment shown in Fig. 6 has proposed, and whenever launching again in the mode identical with the embodiment shown in Fig. 5 when transmitting, is mapped to this antenna index that transmits and just changes, simultaneously when launching this again and transmit, with regard to each real part and imaginary part of separting transomission.Therefore, pin is in each symbol obtains channel diversity in the antenna territory when in the embodiment of above Fig. 5, not only in the antenna territory, obtain channel diversity, but also in the real domain of each symbol and imaginary field, also obtained channel diversity, thereby further improved performance.
Specifically, according to this embodiment, can be in first when emission the real part (S with distinct symbols 1, I, S 2, I) be mapped to first antenna, make as shown in Figure 6, when first emission with signal S 1, I+ jS 2, IBe mapped to first antenna.That is,, same real part that transmits and imaginary part launch this real part and imaginary part by being mapped to different antennas.For example, with S 1, IBe mapped to first antenna and with S 1, QBe mapped to second antenna.In addition, the S that when first emission, launches by first antenna 1, IWhen second emission, launch, when the 3rd emission, launch, and when the 4th emission, launch by the 4th antenna by second antenna by third antenna.In this mode, when emission transmitted, each transmitted and all is mapped to different antennas, thereby obtained the diversity gain in the antenna territory.
When as shown in Figure 6 four transmitting antennas are provided the time, when symbol was launched at least four times, the component of each symbol experienced the channel of all four antennas uniformly, thereby made diversity maximization.
Fig. 7 illustrates the method that is used for according to an embodiment of the invention in the multiaerial system emission complex signal that comprises two antennas.
When above embodiment with reference to figure 6 descriptions is applied to comprise the system of two transmitting antennas, as shown in Figure 7, each transmits and is launched at least twice, makes each transmit and experiences the channel of all antennas uniformly, thereby make channel diversity gain maximization.
Although diagram not in the specific example of Fig. 6 and Fig. 7, when coming to launch again this according to a preferred embodiment of the invention and transmit, each component that transmits can alternately be mapped to the real axis and the imaginary axis of each transmitting antenna.For example, when launching this again and transmit, each component that transmits that is mapped to real axis when first emission can be mapped to the imaginary axis.
Fig. 8 and Fig. 9 illustrate the method that is used for launching in the multiaerial system that comprises four and two antennas complex signal according to a preferred embodiment of the invention respectively.
For example, in the multiaerial system that comprises four antennas, as shown in Figure 8, in the example of Fig. 6, when first emission, be mapped to the S of the real axis of first antenna 1, ICan when second emission, be mapped to the imaginary axis rather than the real axis of third antenna, and when first emission, be mapped to the S of the imaginary axis of first antenna 2, ICan when second emission, be mapped to the real axis of third antenna.Similarly, for example, in the multiaerial system that comprises two antennas, as shown in Figure 9, in the example of Fig. 7, when first emission, be mapped to the S of the real axis of first antenna 1, ICan when second emission, be mapped to the imaginary axis rather than the real axis of second antenna.
According to preferred embodiment, as Fig. 8 and shown in Figure 9, when transmitting again, can change and be mapped to the antenna that each transmits, when transmitting again, real part that this transmits and imaginary part alternately are mapped to the real axis and the imaginary axis of antenna simultaneously.This can obtain extra diversity gain.Aforesaid when transmitting again, each component that transmits is mapped to different antennas, simultaneously when launching this again and transmit, this component that transmits alternately is mapped in the situation of the real axis of antenna and the imaginary axis, each component that transmits can be arranged in the different channel of experience in each emission, in this transmits the system that is using four transmitting antennas, be launched 8 times altogether.Illustrate the example of this mapping method among Figure 10.Similarly, each component that transmits can be arranged in the different channel of experience in each emission, in this transmits the system that is using two transmitting antennas, be launched 4 times altogether.Illustrate the example of this mapping method among Figure 11.
Be the general introduction of the preferred embodiment of the invention described above below.
According to this embodiment, the real part and the imaginary part of when first emission, launching symbol by different antennas.This embodiment comprises any specific mapping method, wherein, carries the real part and the imaginary part of complex signal discretely by different antennas.For example, although as shown in Fig. 6 and Fig. 7, when first emission, can carry S by the real axis of first antenna 1, IComponent, but this S 1, IComponent also can carry by the imaginary axis of first antenna or by different antennas.
According to this embodiment, launch each component by the antenna different with the antenna that when first launches, carries each component.This embodiment can also comprise following method, wherein, and by carrying component to the different antenna of the antenna in the method shown in Figure 11 with Fig. 6.That is, this embodiment comprises any specific launching technique, wherein, when real part that transmits whenever emission and imaginary part, just carries this real part that transmits and imaginary part discretely by different antennas.For example, when having launched each component (real part and imaginary part) by specific antenna when in current emission, this component is configured to launch by the antenna different with this specific antenna during next the emission.When the catalogue number of emission during less than the total number of transmitting antenna, preferably, when each component of transmitting again, this each component that transmits is mapped to different antennas, make and can not launch each component that this transmits by identical antenna.When each component of after the number that outnumbers transmitting antenna of emission, transmitting again, each component that this can be transmitted be mapped to before launched in identical transmitting antenna index.Yet, according to the above preferred embodiment of describing with reference to figure 8 and Fig. 9, this each component that transmits just is mapped to different antennas when transmitting again, simultaneously this each component that transmits just alternately is mapped in the situation of the real axis of antenna and the imaginary axis when launching this again and transmit, shown in Figure 10 and 11, each component that transmits can be configured to be mapped to previous emission in the different position, position that is mapped to, reach the twice of the number of antenna until the total number of emission.
Above-mentioned embodiments of the invention not only can be applied to OFDM (OFDM) structure, and can be applied to single carrier structure in an identical manner, such as single carrier-frequency division multiplexing (SC-FDM) structure.When using the OFDM structure, not only can be in the antenna territory but also can be in the subcarrier territory distribute and transmit in distributed mode, and can be only in the antenna territory, distribute in distributed mode and transmit.In single carrier structure, use above-mentioned rule when launching again when only using the antenna territory to carry out such as SC-FDM.
According to these embodiment of the present invention,, therefore can obtain channel diversity because each transmits and all experiences different channels when emission transmits.Particularly, when plural real part that transmits of emission and imaginary part, the real part that this plural number is transmitted is mapped to different antennas with imaginary part, thereby has not only obtained the diversity gain in the antenna territory, but also has obtained the diversity gain in real domain and the imaginary field.
With reference to the detailed simulation result of wherein having used embodiment the diversity gain that obtains according to embodiments of the invention is described.
Be employed various parameters in emulation below.
Table 1
Figure G2008800133059D00121
In the following description, to be described in reference to simulation result and use according to an embodiment of the invention that growth data distributes the situation of (SDA) method and used between the situation of general launching technique again, at the comparison of the frame error rate (FER) of the level of each modulation and encoding scheme (MCS) the SNR performance.
Figure 12 illustrates FER in the detailed example according to an embodiment of the invention to the SNR performance, wherein, carries out in the communication system of using two transmitting antennas and comprises two emissions of emission again.
Specifically, Figure 12 shows and is using two transmitting antennas and carrying out under the hypothesis of two emissions, the real part that all this plural number is transmitted when launching the plural real part that transmits with imaginary part at basis embodiments of the invention as shown in Figure 7 is mapped to different antennas with imaginary part, simultaneously each component has been mapped to the situation of different antennas and application as shown in Figure 3 between the situation of general launching technique, when the MCS level of the code rate of QPSK 1/2 and the FER when the MCS level of the code rate of 16QAM 1/2 to the comparison of SNR performance.
Can see the comparison of SNR performance from the FER shown in Figure 12, when with as shown in Figure 3 general launching technique relatively the time, according to the abovementioned embodiments of the present invention, in the situation of the QPSK with code rate of 1/2, FER place 10% obtains the SNR gain of about 2.2dB, and obtains the SNR gain of about 2.3dB at 1% FER place.Can also see, with as shown in Figure 3 general launching technique relatively the time, according to the abovementioned embodiments of the present invention, in the situation of the 16QAM with code rate of 1/2, FER place 10% obtains the SNR gain of about 1.7dB, and obtains the SNR gain of about 1.8dB at 1% FER place.
Figure 13 illustrates FER in the detailed example according to an embodiment of the invention to the SNR performance, wherein, carries out in the communication system of using four transmitting antennas and comprises two emissions of emission again.
Specifically, Figure 13 shows and is using two transmitting antennas and carrying out under the hypothesis of two emissions, the real part that all this plural number is transmitted when launching the plural real part that transmits with imaginary part at basis embodiments of the invention as shown in Figure 6 is mapped to different antennas with imaginary part, simultaneously each component the situation of different antennas and application as shown in Figure 3 have been mapped between the situation of general launching technique, in the FER of the MCS level of the code rate of the MCS level of the code rate of QPSK 1/2 and 16QAM 1/2 comparison to the SNR performance.
Can see the comparison of SNR performance from the FER shown in Figure 13, when with as shown in Figure 3 general launching technique relatively the time, according to the abovementioned embodiments of the present invention, in the situation of the QPSK with code rate of 1/2, FER place 10% obtains the SNR gain of about 1.9dB, and obtains the SNR gain of about 2.0dB at 1% FER place.Can also see, when with as shown in Figure 3 general launching technique relatively the time, according to the abovementioned embodiments of the present invention, in the situation of the 16QAM with code rate of 1/2, FER place 10% obtains the SNR gain of about 2.2dB, and obtains the SNR gain of about 3.2dB at 1% FER place.
Figure 14 illustrates FER in the detailed example according to an embodiment of the invention to the SNR performance, wherein, carries out in the communication system of using four transmitting antennas and comprises three four emissions of emission again.
Specifically, Figure 14 shows and is using two transmitting antennas and carrying out under the hypothesis of two emissions, the real part that all this plural number is transmitted when launching the plural real part that transmits with imaginary part at basis embodiments of the invention as shown in Figure 6 is mapped to different antennas with imaginary part, simultaneously each component the situation of different antennas and application as shown in Figure 3 have been mapped between the situation of general launching technique, in the FER of the MCS level of the code rate of the MCS level of the code rate of QPSK 1/2 and 16QAM 1/2 comparison to the SNR performance.Under this environment, more than the embodiments of the invention described with reference to figure 6 can obtain the optimum channel diversity.
Can see the comparison of SNR performance from the FER shown in Figure 14, when with as shown in Figure 3 general launching technique relatively the time, according to the abovementioned embodiments of the present invention, in the situation of the QPSK with code rate of 1/2, FER place 10% obtains the SNR gain of about 3.0dB, and obtains the SNR gain of about 3.8dB at 1% FER place.Can also see, when with as shown in Figure 3 general launching technique relatively the time, according to the abovementioned embodiments of the present invention, in the situation of the 16QAM with code rate of 1/2, FER place 10% obtains the SNR gain of about 4.0dB, and obtains the SNR gain of about 5.0dB at 1% FER place.
During owing to real part that transmits whenever emission and imaginary part, this real part that transmits is mixed with imaginary part and be mapped to different antennas, so each of the method for embodiments of the invention described above all is the simple method that does not need to consider overhead.According to embodiments of the invention, even because when using fixing sub-carrier indices in ofdm system, the hybrid antenna index is launched this and transmitted, and therefore can obtain enough gains.This embodiment provides the method that can use under the situation of the situation of not considering channel status or mobile subscriber.That is, need not feedback information.Transmitting terminal and receiving terminal have predetermined allocation model.Use and to be scheduled to allocation model, can eliminate the needs that send to the extra signaling consumption of receiving terminal from transmitting terminal for generating.
Method can be applicable to any system according to an embodiment of the invention, and does not consider that or not still is a plurality of subcarriers that this system uses single sub-carrier.Specifically, when emission transmits, use the system of single sub-carrier only can change antenna index.When emission transmits, use the system of a plurality of subcarriers to change to be used for antenna distributed index and sub-carrier indices the two.With reference to following method, wherein, in system such as the ofdm system that uses above-mentioned a plurality of subcarriers, transmit and be mapped to a plurality of subcarriers zone rather than a plurality of transmitting antennas, promptly, the example of the modification of the above embodiment that describes with reference to figure 4, wherein, the independent transmission path is a plurality of subcarriers zone rather than a plurality of antennas.
Figure 15 and 16 illustrate according to another embodiment of the invention be used for be mapped to a plurality of subcarriers zone by transmitting and launch the method that this transmits.
In the embodiment shown in Figure 15, such as sub-C K1To sub-C K4A plurality of subcarriers zone be as shown in figure 15 the independent transmission path that transmits and be mapped to.Here, obtain the channel diversity gain, preferably, between each subcarrier zone, have minimum at least coherence bandwidth in order to use this method.
In method shown in Figure 15, as in the embodiment of the above a plurality of transmitting antennas of describing with reference to figure 6 of use, if in case the subcarrier zone is used for transmitting, then as in the embodiment of the above a plurality of transmitting antennas of describing with reference to figure 6 of use, this subcarrier zone just is not used in emission next time when launching this transmits.In order to use this method to obtain the channel diversity gain, as mentioned above, preferably between each subcarrier zone, keep minimum at least coherence bandwidth.Yet, when the number of launching again is very little, the subcarrier zone can be set, make when this transmits when emission, on available frequency band, expand this as far as possible widely and transmit.This can eliminate the expense that is used for providing with signal transmitting channel selective information the coherence bandwidth length information.In not having the situation with signal transmitting channel selective information, transmitting terminal and receiving terminal have predetermined allocation model and (specifically, share predetermined sub-C kThe information at the interval between the index).Use predetermined allocation model, can eliminate the needs that send to the extra signaling consumption of receiving terminal from transmitting terminal for generating.In using a plurality of subcarriers the foregoing description as the independent transmission path, as shown in figure 16, each component that transmits can alternately be mapped to the real axis and the imaginary axis in each subcarrier zone.
The above embodiment of the present invention as shown in Figure 15 and Figure 16 that is applied to be used for such as a plurality of subcarriers of the use of ofdm system the system of signal emission can use the above embodiment of the present invention of the system of a plurality of antennas to realize in conjunction with being applied to as shown in Fig. 6 and Fig. 8.In this case, transmit a plurality of independent transmission path of being mapped to can be included in each antenna place and keeps separate a plurality of antennas and a plurality of subcarriers zone.
The above embodiment of the present invention not only can be applied to following situation, owing to also do not receive ack signal from receiving terminal in response to signal is launched into receiving terminal, so transmitting terminal transmits again to receiving terminal, but also can be applied to the system of each code word of repeat its transmission or symbol similarly.For example, as in broadcasting and multicast service (BCMCS) system based on the zone, at transmitting terminal broadcast transmission signal pre-determined number repeatedly in the corresponding region, rather than, after receiving terminal receives ack signal, launching the situation of follow-up signal signal in response to being launched into receiving terminal, when transmitting, transmit by means of repeatedly launching this by different independent transmission paths, perhaps when transmitting, by means of launch real part and the imaginary part that plural number transmits by different transmission paths, can obtain diversity gain.
The above embodiment of the present invention not only can be applied to as mentioned the system of 2 or 4 transmitting antennas of use described in the example of using a plurality of antennas, but also can be applied to use the system of the transmitting antenna of any other number.When the number of employed transmitting antenna in the communication system increases, can increase by the antenna different and launch the number of times that transmits again, thereby obtain higher diversity gain with the antenna that when first launches, is mapped to.
Can use the foregoing description not considering to launch again under the situation of the number of times that transmits.In a preferred embodiment of the invention, when the emission total number that comprises first emission equals or twice or when more being multiple times than the number in independent transmission path, can obtain higher diversity gain.Yet, even when the number of launching is very little, also can realize the raising on the performance.
In addition, according to an embodiment of the invention method can be applied to as shown in fig. 1 single codeword (SCW) structure and many code words (MCW) structure as shown in Figure 2.This method is being applied in the situation of MCW structure, even when using mapping with different modulating size at each code word, use the real part of symbol and imaginary part but not the embodiment of bit according to above-mentioned in distributed mode, also identical mapping method can be used, and performance can be do not reduced.
Those skilled in the art provided the detailed description of the preferred embodiments of the present invention, so that can realize and put into practice the present invention.Although described the present invention with reference to preferred embodiment, person of skill in the art will appreciate that, under the prerequisite that does not depart from the spirit and scope of the present invention described in the claims, can carry out various modifications and variations in the present invention.Therefore, the present invention should not be limited to specific embodiment as described herein, but should meet and principle disclosed herein and the consistent scope the most widely of novel feature.
Industrial applicibility
As apparent from above description institute, embodiments of the invention provide a kind of for In the communication system of using such as a plurality of independent pathways in a plurality of transmitting antennas or a plurality of subcarriers zone The method that transmits in the system, wherein, when emission transmitted, this transmitted and is reflected The independent transmission path that is mapped to just is configured to different, thereby obtains diversity gain. In addition, Be time multiplexed signal when transmitting, separate real part and the imaginary part of this complex signal, and should write a letter in reply Number real part be mapped to different transmission paths with imaginary part, thereby further improve systematic function.

Claims (7)

1. one kind is used for the method that transmits in the communication system with a plurality of independent transmission path, and described method comprises:
First emission process, described first emission process comprise by according to specific mapping ruler a plurality of transmitting being mapped to described a plurality of independent transmission path, launch described a plurality of transmitting; And
Second emission process, described second emission process comprises by in described a plurality of the transmitting each being mapped to and being mapped to different independent transmission path, the described independent transmission path that transmits in described first emission process, launches described a plurality of transmitting again.
2. method according to claim 1, wherein, described transmitting is complex signal, and
By in described first and second emission processs, the real part of described complex signal being mapped to different independent transmission paths with imaginary part, launch the real part and the imaginary part of described complex signal.
3. method according to claim 1 further comprises the emission process that at least one is extra, and described extra emission process comprises: by described a plurality of transmitting is mapped to described a plurality of independent transmission path, launch described a plurality of transmitting,
Wherein, when the total number of the emission process that comprises described at least one extra emission process is less than or equal to the number in described a plurality of independent transmission path, by in each of emission process, in described a plurality of the transmitting each being mapped to different independent transmission paths, launch described a plurality of transmitting.
4. according to any one the described method in the claim 1 to 3, wherein, described communication system is duplicating multi-antenna orthogonal frequency division (OFDM) communication system, and
Described a plurality of independent transmission path comprises at least one by a plurality of antennas and the regional a plurality of transmission paths that form of a plurality of subcarrier.
5. method according to claim 4, wherein, described a plurality of subcarriers zone is the subcarrier zone with the minimum at least coherence bandwidth between the described subcarrier zone.
6. according to any one the described method in the claim 1 to 3, wherein, described communication system is many antennas single carrier-frequency division multiplexing (SC-FDM) communication system, and
Described a plurality of independent transmission path comprises at least one of the transmission path that formed by a plurality of antennas.
7. method that is used in a plurality of complex signals of communication system emission with a plurality of independent transmission path, described method comprises:
The real part of described a plurality of complex signals is mapped to different independent pathways with imaginary part; And
Launch mapped a plurality of complex signals.
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